The following thesis is Steerable Antenna focused on the phase shifter part for GNSS application which working from 1.55 GHz to 1.57 GHz. The purpose of this thesis is to design an Analog Phase Shifter with the capability of phase shifting in 360◦and a low return loss ratio. In this thesis, a quadratic hybrid branch line is used as the main part. The key component of the phase shifter is the Varactor Diode which its Capacitor value is varying by changing DC voltage which I used two of it. It works from 0 V to 5 V and its capacitance value is change in 12 different values.